Originally Posted by joe801
It's good, but what do I know. Since i didn't learn anything. Just saying, not being a smart a**.
Hopefully this explanation will help.
HDMI is a digital signal. This means all data is sent using bits. In other words, there's only two values (for example: 0 or 1). Imagine communicating with someone over a distance by turning a flashlight on and off
in a specific pattern.
By contrast, an analog signal has a "range" of values. So, instead of using an on/off switch on your flashlight, an analog signal would be like using a brightness dial. The flashlight is always on, but the message changes based on how bright
the flashlight is.
The reason picture quality degrades with analog cables (not HDMI) is due to the effects of interference. For my example, interference could be represented by fog.
So, imagine now that it's a foggy day and you're still trying to communicate with a flashlight. Obviously, the brightness is not the same anymore and you can't see the full "range" of brightness (because the dim settings are no longer visible). Therefore, the analog message is different! However, even on a foggy day while the light may be weak, you can still recognize when it's turned on and off. Therefore, the digital message is exactly the same even with some interference!
Now, obviously if there's too much
fog, you can't see the flashlight at all. This is why an HDMI signal is typically either perfect or blank
There is a borderline when the fog is "just right" that it's hard to see every flash of the flashlight. This will cause your picture to show "sparkles" or lines because not every pixel was read properly.
The short explanation is this: if you have a bad HDMI cable or a bad signal, the problem is very obvious. You either have no picture at all, or you will get dots/lines. A problem with your HDMI connection does not cause a blurry picture.
Also, to answer your other question, the reason there are two types of HDMI cables is because the features of HDMI have evolved. "Standard" cables are certified for the original tests which support a bandwidth of up to 2.25Gb/s. "High speed" was introduced in October of 2008 and supports a bandwidth up to 10.2 Gb/s. You may or may not need the extra bandwidth of "high speed" depending on your source/equipment.
The problem you describe is not a cable problem though; it's a network problem. Besides considering your internet connection, you also have to consider the quality of your home network. Network interference will cause corrupted messages which have to be dropped and resent (this slows everything down). This is especially true if you're using a wireless network which is prone to all sorts of possible interference.
I hope that helps.